Temperatures are expected to continue to plummet with the possibility of snow over the weekend and early next week.
The Met Office forecast for London and the South-east is cloudy tomorrow with outbreaks of rain, perhaps turning wintry later.
Snow showers are forecast on Sunday in cold winds with further snow possible on Monday.
Sunny spells and wintry showers are expected to affect the country on Tuesday and Wednesday.
The showers are expected to be most frequent towards the east with snow likely to low levels, giving the risk of significant accumulations across some eastern counties.
It will be cold, locally very cold, with widespread overnight frost and ice.
The Institute of Advanced Motorists (IAM) has issued advice for driving on snow and ice.
IAM chief examiner Peter Rodger said: "When there's snow on the ground, avoid travelling unless absolutely necessary, and don't ignore police warnings or advice to not travel on specific routes."
Advice on driving safely in wintry weather includes -
• Make sure your windows are clear and that you have all-round visibility before you set off.
• Take the time to thoroughly clear your roof and windows of snow.
• When driving in snow, get your speed right - not too fast that you risk losing control, but not so slow that you risk losing momentum when you need it.
• Start gently from a stationary position, avoiding high revs. Stay in a higher gear for better control and, if it is slippery, in a manual car move off in a higher gear rather than automatically using first.
• If you find yourself in a skid, the main thing to remember is to take your foot off the pedals and steer - only use the brake if you cannot steer out of trouble.
• Double or even triple your normal stopping distance from the vehicle in front so you are not just relying on your brakes to be able to stop. It simply may not happen!
• It’s better to think ahead as you drive to keep moving, even if it is at walking pace.
• Plan your journey around busier roads as they are more likely to have been gritted. Avoid using short cuts on minor roads – they are less likely to be cleared or treated with salt, especially country lanes and housing areas.
• Bends are a particular problem in slippery conditions – slow down well before you get to the bend, so that by the time you turn the steering wheel you have already lost enough speed.
• On a downhill slope, get your speed low before you start the descent, and do not let it build up – it is much easier to keep it low than to try and slow down once things get slippery.
And if the worst does happen:
• Keep track of where you are. If you do have to call for assistance, you need to be able to tell the breakdown or emergency services your location so they can find you.
• If you must leave your vehicle to telephone for assistance, find a safe place to stand away from the traffic flow; the next driver could lose control in the same place.
• On motorways and dual carriageways it is always better to leave your vehicle and stand a short distance behind and to the safe side of it. Don’t stand in front of it if at all possible. Balancing the risks of a collision and hypothermia is something that depends on your situation.
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